﻿var cut_div; //裁减图片外框div
	var cut_img; //裁减图片
	var imgdefw; //图片默认宽度
	var imgdefh; //图片默认高度
	var offsetx = 82; //图片位置位移x
	var offsety = -230; //图片位置位移y
	var divx = 284; //外框宽度
	var divy = 266; //外框高度
	var cutx = 120; //裁减宽度
	var cuty = 120; //裁减高度
	var zoom = 1; //缩放比例

	var zmin = 0.1; //最小比例
	var zmax = 10; //最大比例
	var grip_pos = 5; //拖动块位置0-最左 10 最右
	var img_grip; //拖动块
	var img_track; //拖动条
	var grip_y; //拖动块y值
	var grip_minx; //拖动块x最小值
	var grip_maxx; //拖动块x最大值

	//图片初始化
	function imageinit() {

		cut_div = document.getElementById('cut_div');
		cut_img = document.getElementById('cut_img');
		imgdefw = cut_img.width;
		imgdefh = cut_img.height;

		if (imgdefw > divx) {
			zoom = divx / imgdefw;
			cut_img.width = divx;

			cut_img.height = Math.round(imgdefh * zoom);
		}

		cut_img.style.left = Math.round((divx - cut_img.width) / 2);
		cut_img.style.top = Math.round((divy - cut_img.height) / 2) - divy;

		if (imgdefw > cutx) {
			zmin = cutx / imgdefw;
		} else {
			zmin = 1;
		}
		zmax = zmin > 0.25 ? 8.0 : 4.0 / Math.sqrt(zmin);
		if (imgdefw > cutx) {
			zmin = cutx / imgdefw;
			grip_pos = 5 * (Math.log(zoom * zmax) / Math.log(zmax));
		} else {
			zmin = 1;
			grip_pos = 5;
		}

		Drag.init(cut_div, cut_img);
		cut_img.onDrag = when_Drag;
	}

	//图片逐步缩放
	function imageresize(flag) {
		if (flag) {
			zoom = zoom * 1.5;
		} else {
			zoom = zoom / 1.5;
		}
		if (zoom < zmin)
			zoom = zmin;
		if (zoom > zmax)
			zoom = zmax;
		cut_img.width = Math.round(imgdefw * zoom);
		cut_img.height = Math.round(imgdefh * zoom);
		checkcutpos();
		grip_pos = 5 * (Math.log(zoom * zmax) / Math.log(zmax));
		img_grip.style.left = (grip_minx + (grip_pos / 10 * (grip_maxx - grip_minx)))
				+ "px";
	}

	//获得style里面定位
	function getStylepos(e) {
		return {
			x :parseInt(e.style.left),
			y :parseInt(e.style.top)
		};
	}

	//获得绝对定位
	function getPosition(e) {
		var t = e.offsetTop;
		var l = e.offsetLeft;
		while (e = e.offsetParent) {
			t += e.offsetTop;
			l += e.offsetLeft;
		}
		return {
			x :l,
			y :t
		};
	}

	//检查图片位置
	function checkcutpos() {
		var imgpos = getStylepos(cut_img);

		max_x = Math.max(offsetx, offsetx + cutx - cut_img.clientWidth);
		min_x = Math.min(offsetx + cutx - cut_img.clientWidth, offsetx);
		if (imgpos.x > max_x)
			cut_img.style.left = max_x + 'px';
		else if (imgpos.x < min_x)
			cut_img.style.left = min_x + 'px';

		max_y = Math.max(offsety, offsety + cuty - cut_img.clientHeight);
		min_y = Math.min(offsety + cuty - cut_img.clientHeight, offsety);

		if (imgpos.y > max_y)
			cut_img.style.top = max_y + 'px';
		else if (imgpos.y < min_y)
			cut_img.style.top = min_y + 'px';
	}

	//图片拖动时触发
	function when_Drag(clientX, clientY) {

		checkcutpos();
	}

	//获得图片裁减位置
	function getcutpos() {
		//var flag = checkPic();
		//if(flag==true){
	if(document.getElementById('cut_img').src!=''){ 
		var imgpos = getStylepos(cut_img);
		var x = offsetx - imgpos.x;
		var y = offsety - imgpos.y;
		var cut_pos = document.getElementById('cut_pos');
		cut_pos.value = x + ',' + y + ',' + cut_img.width + ','
				+ cut_img.height;
		return true;
		}
		else{
			return false;
			}
	}

	//缩放条初始化
	function gripinit() {
		img_grip = document.getElementById('img_grip');
		img_track = document.getElementById('img_track');
		track_pos = getPosition(img_track);

		grip_y = track_pos.y;
		grip_minx = track_pos.x + 4;
		grip_maxx = track_pos.x + img_track.clientWidth - img_grip.clientWidth
				- 5;

		img_grip.style.left = (grip_minx + (grip_pos / 10 * (grip_maxx - grip_minx)))
				+ "px";
		img_grip.style.top = grip_y + "px";

		Drag.init(img_grip, img_grip);
		img_grip.onDrag = grip_Drag;

	}

	//缩放条拖动时触发
	function grip_Drag(clientX, clientY) {

		var posx = clientX;
		img_grip.style.top = grip_y + "px";
		if (clientX < grip_minx) {
			img_grip.style.left = grip_minx + "px";
			posx = grip_minx;
		}
		if (clientX > grip_maxx) {
			img_grip.style.left = grip_maxx + "px";
			posx = grip_maxx;
		}

		grip_pos = (posx - grip_minx) * 10 / (grip_maxx - grip_minx);
		zoom = Math.pow(zmax, grip_pos / 5) / zmax;
		if (zoom < zmin)
			zoom = zmin;
		if (zoom > zmax)
			zoom = zmax;
		cut_img.width = Math.round(imgdefw * zoom);
		cut_img.height = Math.round(imgdefh * zoom);

		checkcutpos();
	}

	//页面载入初始化
	function avatarinit() {
		imageinit();
		gripinit();
	
	}

	if (document.all) {
		
		window.attachEvent('onload', avatarinit);
	} else {
		
		window.addEventListener('load', avatarinit, false);
	}